Steam-cylinder for steam-engines



(No Model.)

E D. L EAVIT T, J1.

STEAM CYLINDER FORSTEAM ENGINES.

Patented'Apr. 30, 1889.

Invenlor: .Eras nwslll}emvillgJz:

' UNITED STATES PATENT GFFIC.

ERASMUS D. LEAVITT, JR, OF CAMBRIDGEPORT, MASSACHUSETTS.

STEAM-CYLLINIDER FOR STEAM-ENGINES.-

SPECIFICATIONforming part of Letters Patent No. 402,256, dated April 30, 1889;

Application filed October 12, 1888. Serial No. 287,952. (No model.) i i and the piston at the end of each'stroke, thus accomplishinga saving of steam without diminishing the effectiveness of the engine, all as will be readily understood by reference to the description of the drawings and to the claims to be hereinafter given.

Of the drawings, Figure 1 represents a sectional elevation of a steam-cylinder, its heads and valves, and'showing the piston and piston-rod thereof in elevation. Fig. 2 represents an elevation of the upper inlet-chest and port. Fig. 3 represents a sectional ele-v vation of the same with the valve-scat and valve in position, the cutting plane being on line at or on Fig. .5. Fig. 4 represents a similar view of the same parts with the port shown as it has heretofore been constructed; and Fig. 5 represents a sectional plan of the parts shown in Fig. 3, the cutting plane being on line 1) 'v on that figure. Figs. 3, 4, and 5 are drawn to an enlarged scale.

In the drawings, A is a steam-cylinder, provided with the upper and lower inlet-chests, A and A and the upper and lower exhaustchests, B and B The upper end of the cylinder is closed by the head 0. while the lower end is similarly closed by the head D,

through which passes the piston-rod E, upon the upper end of which is secured the piston F, in a well-known manner.

From the interior of the cylinder A to the inlet and exhaust chests A and A B and B the ports or passages G communicate.

Within the inlet-chests A and A over the ports G, are secured the valve-seats H, provided with a series of vertical slots, at a, and outside of this valve-seat H the valve I, proed to slide to close or open said slots at a, as desired, all in a well-known manner. The exhaust-chests B and B are similarly provided with valves and valve-seats; but in this case the valve slides between the port G and the valve-seat, all in a well-known manner:

The ports G are made as shallow as possible in the direction of the length of the cylinder and extend well across the cylinder, as will be seen by reference to Fig. 5, while the slots b b and a a in the valves and valveseats .must be very much deeper in the direction of the length of the cylinder, in order that the aggregate area of said slots in the valve or valve-seat shall equal the area of the ports G in the cylinder. Therefore the outer endsof the ports G have been made flaring, as shown in Fig. 4, so that the steam may readily pass through the slots at a and b b and then through the port G into the cylinder Without being throttled. This flaring mouth of the port has heretofore extended the entire length of the port, which made an entirely unnecessary waste of steam, for the reason that the flaring of the mouthof the port G at points immediately behind the partitions c c in said valves and valve-seats accomplished no useful result, but simply form ed spaces in whichthe steam would lodge.

It has therefore been found desirable to dispense with these useless spaces, and, in-v stead of making a flaring month which extends the Whole length of the port G, to simply provide the outer end of said port with 85 as many flaring passages dd as there are slots in the valve-seat H, with which slots said pasages communicate, as fully shown in Figs. 3 and 5.

By this construction aconsiderable volume of waste-space is dispensed with, which results in a great saving of steam.

What I claim as new, and desire to secure 7 by Letters Patent of the United States, is-

valve and valve-seat, each provided with a series of transverse slots or ports, and a cylinder having a port or passage made shallow in the direction of the length of said cylinder 50 vided with corresponding slots, b b, is adaptfor the greater part of the distance from its 100 inner to its outer end, and terminating at its In testimony whereof Ihave signed inyname outer end in a series of flaring passages eorto this specification, in the presence of two sub-- responding in number and height in the discribing witnesses, 011 this 8th day of'October, reetion of the length of the cylinder to the A. D. 1888. 5 length of the slots 0r ports in the valves.

2. A steam-cylinder provided with a shal- ERASMUS D. LEAVITT, JR. low passage extending from each steam-chest to the interior of said cylinder and terminat- \Vitnesses: ing at its outer end in a series of flaring FRANCIS WV. DEAN, 10 smaller passages,substantially as and for the GEORGE E. \VHITNEY.

purposes described. 

